diff --git a/client.go b/client.go
index ec2dc24..5eeafb2 100644
--- a/client.go
+++ b/client.go
@@ -4,8 +4,12 @@ import (
 	"github.com/fiorix/wsdl2go/soap"
 )
 
-//CityCODPaymentLimit represents default C.O.D. payment limit for all dpd cities in which C.O.D. is available
-const CityCODPaymentLimit = 250000
+const (
+	trackingByDPDOrderNamespace = "http://dpd.ru/ws/tracing/2012-06-25"
+
+	//CityCODPaymentLimit represents default C.O.D. payment limit for all dpd cities in which C.O.D. is available
+	CityCODPaymentLimit = 250000
+)
 
 //Client for DPD soap api
 type Client struct {
@@ -343,7 +347,8 @@ func (cl *Client) GetStatesByDPDOrder(req *TrackByDPDOrderRequest) (*ParcelsStat
 	}{
 		operationGetStatesByDPDOrder{
 			&getStatesByDPDOrder{
-				req,
+				Namespace: trackingByDPDOrderNamespace,
+				Request:   req,
 			},
 		},
 	}
diff --git a/tracking.go b/tracking.go
index 701b42d..e2a2a28 100644
--- a/tracking.go
+++ b/tracking.go
@@ -77,11 +77,13 @@ type operationGetStatesByDPDOrder struct {
 }
 
 type getStatesByDPDOrder struct {
-	Request *TrackByDPDOrderRequest `xml:"request,omitempty"`
+	Namespace string                  `xml:"xmlns,attr"`
+	Request   *TrackByDPDOrderRequest `xml:"request,omitempty"`
 }
 
 //TrackByDPDOrderRequest GetStatesByDPDOrder request body
 type TrackByDPDOrderRequest struct {
+	Namespace  string  `xml:"xmlns,attr"`
 	Auth       *Auth   `xml:"auth,omitempty"`
 	DpdOrderNr *string `xml:"dpdOrderNr,omitempty"`
 	PickupYear *int    `xml:"pickupYear,omitempty"`